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A military aircraft engine was among the finds

The human skull, which is thought to date back to the Napoleonic Wars, has been passed to police in Portsmouth.

Capt Iain Greenlees, who is in charge of the dredging project said: "There was a burial ground on one of the islands in the harbour and it was almost certainly washed away from there."

Other items included bottles, plates and ceramics - all of which have been passed to archaeologists at Wessex Archaeology for study.

The dredging, which started in September 2015, was carried out to allow HMS Queen Elizabeth - due to arrive later this year - and its sister ship, Prince of Wales, to be based at Portsmouth Naval Base.